Problem with (Understanding) function Post: 302993156

10 More Discussions You Might Find Interesting

1. Filesystems, Disks and Memory

having problem in understanding namei module

can anyone give me some idea on unix filesystem namei's algorithsm

2. Shell Programming and Scripting

egrep understanding problem

Hi, Can anyone please let me know the meaning of this line,i am not able to understand the egrep part(egrep '^{1,2}).This will search for this combination in beginning but what does the values in {}signifies here. /bin/echo $WhenToRun | egrep '^{1,2}:$' >/dev/null

3. Shell Programming and Scripting

Help needed for understanding a function

There is a function called start: start() { echo -n $"Sending Startup Email: " echo "${RESTARTBODY}" | mutt -s "${RESTARTSUBJECT}" ${EMAIL} RETVAL=$? if ; then touch ${LOCKFILE} success else failure fi echo return ${RETVAL} } Can anyone explain what the bold part of the...

4. Shell Programming and Scripting

Problem with the shell script for understanding

Can Anybody please tell me the meaning of the script: #!/bin/sh str=$@ echo $str | sed 's/.*\\//' exit 0

5. UNIX for Dummies Questions & Answers

Problem understanding Paths

If I don't explain my issue well enough, I apologize ahead of time, extreme newbie here to scripting. I'm currently learning scripting from books and have moved on to the text Wicked Cool Shell Scripts by Dave Taylor, but there are still basic concepts that I'm having trouble understanding. ...

6. Shell Programming and Scripting

Problem in understanding export uses

i am beginner in shell scripting. not able to understand what below line will do. PS1=${HOST:=�uname -n�}"$ " ; export PS1 HOST below is the script #!/bin/hash PS1=${HOST:=�uname -n�}"$ " ; export PS1 HOST ; echo $PS1 and i getting the below output �uname -n�$

7. Shell Programming and Scripting

Problem on understanding the regexp command

Hi all, I'm not clear of this regexp command: regexp {(\S+)\/+$} $String match GetString From my observation and testing, if $String is abc/def/gh $GetString will be abc/def I don't understand how the /gh in $String got eliminated. Please help. Thanks

8. Shell Programming and Scripting

Problem in understanding debugging

Hi i was going through the script debugging technique. below example was given in the book. 1 #!/bin/sh 2 3 Failed() { 4 if ; then 5 echo "Failed. Exiting." ; exit 1 ; 6 fi 7 echo "Done." 8 } 9 10 echo "Deleting old backups,...

9. Shell Programming and Scripting

Need help understanding a function

Hello, I recently started going in depth with the shell, so I started learning from Linux Shell Scripting CookBook, 2nd edition. I am at the first chapter atm, and the author tells to define a function in the ~/.bashrc. The function is below. prepend() { && eval $1=\"$2':'\$$1\" && export...

10. Shell Programming and Scripting

Understanding an example of perl map() function

Hello, I have many folders under which there is always a file with the same name, which contains the data I need to process later. A perl oneliner was borrowed perl -e 'print "gene_id\t", join("\t", map {/(.*)\//; $1} @ARGV),"\n";' *_test.trim/level.csvto make a header so that each column...

LEARN ABOUT SUNOS

endusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)